The town in which the Sint-Lambertus church is located is not called Heist-op-den-Berg for nothing. In the town lies a large hill, with the church on top and around the church square houses from mainly the late 18th and 19th century. The road from the town to the top is very logically called Bergop. The Catholic parish church, largely walled, is old. The original church was built around 1340 and expanded over the centuries. Dedicated to Saint Lambertus of Maastricht, who is said to have converted people on this mountain in the 7th century. The current church is a three-aisled cruciform church, Gothic architectural style, beautiful pointed arch windows and a square sturdy integrated tower with spire. The church is largely built of beautiful light gray sandstone, probably quarried in the area. In 1585 the church was destroyed by Dutch troops, i.e. troops from the Northern Netherlands who fought against the Spanish troops (80-year war). The restoration of the church took many years. But the result is impressive .. beautiful church on a spacious church square. Unfortunately the church is closed. Inside you can admire early 20th century murals.